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Okenia rhinorma  Rudman, 2007

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Okenia rhinorma is elongate and relatively high with a distinct ridge running around the mantle edge. The rhinophores are extremely long. The body is opaque white with a pattern of translucent regions, and orange and purple patches or spots. The size and proportion of orange and purple patching varies in different animals. The lateral papillae are white with orange tips and a subapical purple band. The rhinophores are translucent white mottled with purple patches, orange at the tip.
Let me quote Bill Rudman concerning its name: "I made the species name up by combining rhin from 'rhinophore' and orma from 'enormous' because of its unusually long rhinophores."
More information on Okenia rhinorma are on Bill Rudman's Sea-Slug Forum!